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C. G. OSTEMAN.

BINDING AND WEIGHTING SYSTEM FOR BELT DRIVES.

' APPLICATION FILED on. 21. 1919.

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CARL G. OSTEMAN, 015 BOSTON, MASSACHUSETTS, ASSIGNOR TO S. A. WOODSMACHINE COMPANY, OF BOSTON, MASSACHUSETTS, A CORPORATION 0EMASSACHUSETTS.

BINDING AND WEIGHTING SYSTEM FOR BELT-DRIVES.

Specification of Letters Patent.

Patented Dec. 23, 1919.

Application filed October 2'7, 1919. Serial No. 333,465.

To all whom it may concern:

Be it known that I, CARL G. OsTEMAN,a citizen of the United States, anda resident of Boston, county of Suffolk, and State of Massachusetts,have invented an Improvement in Binding and Weighting Systems forBelt-Drives, of which the following description, in connection with theaccompanying drawings, is a specification, like characters on thedrawings representing like parts.

This invention relates to a binding and weighting system for belt driveswherein it is desired to so tension the belts as to pen mit mechanismsto be run at high speed. The invention is applicable in particular tothe drive of wood working machines, such as planers, matchers, m'oldersand surfaces or the profiling attachments for such machines. For thepurpose of illustration I have herein shown an embodiment of theinvention adapted to the drive for the surfacing heads of a molder.

My invention will best be understood by reference to the followingdescription taken in connection with the accompanying drawings, whereinI have shown in side elevation a portion of a molder with an embodimentof my invention applied thereto.

In the drawings, I have shown as much of a molder as is necessary tounderstand the application of my device to the drive thereof, themachine embodying upper and lower heads driven respectively by the belts7 and 9 from the drive pulley 11. The belt 7 may embrace the pulley 11in the ordinary manner and is tensionedby a top binder pulley or gravitybinder 13' contacting exteriorly therewith. The upper run of the belt 9may contact with the drive pulley 11 throughout a suitable arc and, thebottom run bein guided by the idler pulley 15, the belt is tensioned bybinder pulley 17 contacting therewith interiorly and tensioning the runson the drive pulley 11 and idler pulley 15 respectively. The pulleys 13and 17 may be supported respectively on the swinging arms 19 and 21,pivoted on shaft 23.

pulley of large mass without the damaging e fiect of a heavy weight onthe belt and trated I utilize a weighted lever 25 conneoted to theswinging arm-s 19 and 21 and herein a link 27 is connected to the arm 19relatively close to the fulcrum so that the tendency of the weight tolift the pulley 13 is with comparatively small mechanical advantage, theleverage, in fact, being markedly in favor of the pulley. The lever 25is further connected by link 29 to the arm 21 and at a point relativelyremote from the fulcrum thereof to exert a lifting tendency on the armhaving a comparatively great mechanical advantage which, in combina tionwith the leverage provided in the weighted lever 25, will exert a strongtension on pulley 17 so as to counterbalance the same against gravityand exert a strong upward pull on the belt 9.

In the construction described the lever 25 is suspended by the two links27 and 29 and to position the parts one of the links as 27 may beconnected to the frame by a radius link 31, pivoted at 33. It will beseen that the entire system floats about the point 33 and each part isadapted to transmit motion to the rest so that if there is any tendencyfor either of the pulleys to move, the entire system is set in motionand this motion is resisted by the inertia of the entire system. Aneffective binding tension is provided for belt 9 and a part of theweight of the top binder 13 is counterbalanced so that a pulley ofrelatively great mass may be used while comparatively small weight isexerted on the belt 7.

Link 29 may conveniently take the form of a rod swiveled' in arm 21 andthreaded into a block 35 pivoted in the end of lever 25. The rod isprovided with'a squared end 37 by which it may be turned to change theeffective length thereof. Thus the proper amount of counterbalancingthrust may be exerted on link 27 and link or rod 29 then points ofconnection between arms 19 and 21 and links 27 and 29. Herein arm 19 isprovided with a series of holes 39 by any one of which link 27 may besecured and the arm 21 is provided with an elongated boss 41 having aseries of openings by any one of which may be secured the block 43 inwhich rod 29 is swiveled.

Under certain circumstances it may be desired to drive one of the belts7 and 9 in the absence of the other or through an accident one of thebelts may break. The mechanism herein disclosed will function properlyin the absence oi? either belt. If the belt 9 is removed thecounterweight will fall to the fioor swinging arm 21 up but the systemwill still be effective to counterbalance the pulley 13 on arm 19, theweight of pulley 21 then acting on lever 25 as on a lever 01: the secondclass, so called. If the top belt'7 is removed the arm 19 tends to falland, to limit its downward movement so that it may not crash into thedrive pulley 11 a stop 40 may be provided cooperating with a projectingend of radi'us link 31. The link comes in contact with this stop andsupports the arm 19. The point of connection of the link 27 with thelever 25 then acts as a fixed fulcrum about which the weight acts on arm21 of the other binder.

I have described in detail the particular embodiment of my inventionshown by way of example in the accompanying drawings. It should beunderstood, however, that the particular design of motion transmittingmeans and the other mechanical details, while suitable for carrying outthe purposes of my invention, are not essential to the principleinvolved. The invention may be embodied in various other mechanicalforms and what I claim as new and desire to secure by Letters Patentis 1. In combination with a pair of belts, binder pulleys cooperatingwith the belts respectively, a weight for positioning the pul leys andmeans connecting pulleys and weight as a floating system whereindisplace niiant of any part is resisted by the inertia of a 2'. Incombination with a pair of belts, an eXte-riorly disposed binder pulleyfor one, an interiorly disposed binder pulley for the other, a weightconnected to the latter pulley to thrust the same outwardly and to theformer to counter-balance the same.

8. In combination with a pair of belts, a swinging arm carrying a binderpulley contacting exteriorly with one belt, a second swinging armcarrying a binder pulley contacting interiorly with the other belt, aweight and means for connecting the weight to the first arm relativelyclose to the fulcrum and: to the second remote from the fulcrum..-

4:. In combination with a pair of belts, a swinging arm carrying abinder pulley contacting exteriorlywith one belt, a second swinging armcarrying a binder pulley con tacting interiorly with the other belt.weight and means for connecting the weight to the first arm relativelyclose to the fulcrum and to the second remote from the tulcrum, theconnections being adapted to transmit motion whereby movement of anypart is resisted by the inertia of the system.

5. In combination with a pair of belts, a swinging arm carrying a binderpulley contacting eXteriorly with one belt, a second swinging armcarrying a binder pulley contacting interiorly with the other belt, alink suspending a weighted lever from said first arm with relativelysmall mechanical advantage and a second link connecting said lever tothe second arm with relatively great mechanical advantage.

6. A combination as described in claim 5 wherein one of the links isadjustable,

7. In combination with a pair of belts, a swinging arm carrying a binderpulley contacting exteriorly with one belt, a second swinging armcarrying a binder pulleycontacting interiorly with the other belt, alink suspending a weighted lever from said first arm with relativelysmall mechanical advantage, a common weighting means acting on the firstarm with comparatively small mechanical advantage to counter-balance thepulley and on the second with comparatively great mechanical advantageto tension the corresponding belt and a stop limiting the inwardmovement of the first arm.

8. In combination with a pair of belts, an interiorly disposed binderpulley for one, an exteriorly disposed binder pulley for the other, aweighted arm and links suspending said arm connected to said pulleys totend to raise both of the same.

9. In combination with a pair of belts, an interiorly disposed binderpulley for one, an exteriorly disposed binder pulley for the other, aweighted arm, links suspending said arm connected to said pulleys totend to raise both of the same and a stop limiting upward movement ofthe link for said exteriorly disposed pulley.

10. In combination with a pair of belts, an interiorly disposed binderpulley for one, an exteriorly disposed binder pulley for the other,"aweighted arm, links suspending said arm connected to said pulleys totend to raise both of the same and a radius link positioning one of thesuspending links.

11. In combination with a pair of belts, an interiorly disposed binderpulley for one, an exteriorly disposed binder pulley for the other, aweighted arm. links suspending said arm connected to said pulleys totendto raise both of the same, a radius link positioning that suspendinglink whichpertains to the eXteriorly disposed pulley and a stopcooperating therewith to limit upward movement of the suspending link.

12. In combination with a pair of belts raise both of the same and Withprovision for adjusting the connection to vary the ef- 10 fectivelifting and means for positioning the linkage.

In testimony whereof, I have signed my name to this specification.

CARL G. OSTEMAN.

